RE: How to change Java Versions on AS400

Chad,
        Here you go:

This document and many others can be found by selecting the "Technical
databases" link at the iSeries Technical Support website at the following
URL:

       http://www.ibm.com/eserver/iseries/support


While you are there, check out other exciting offerings such as iPTF and
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IBM Support Line
Technical Document

    Document Number:   19754920
  ____________________________________________________________
  Functional Area:                       Operating System
  SubFunctional Area:               Programming
  SubSubFunctional Area:       JAVA
  ____________________________________________________________
  Product:  5769jv1
  Release:

  Classification:       Entitled/Advanced

  Keywords:
 ____________________________________________________________
 Document Title:Changing Default Version for JDK (java.version)
 Document Description:
  Question:  If I have multiple JDKs installed, can I change the default
JDK to a different version?

Answer:  A number of properties are set when the Java virtual machine
starts.  To change the version of the Java virtual machine, you will need
to set the property for Java version (java.version).  Use one of the
following methods to set the property:
                                                                           
                                                                           
  o   Provide a file in /QIBM/UserData/Java400, named                      
      SystemDefault.properties.  The property values that you specify in   
      this file override the system defaults that IBM provides.  This      
      file sets the default system properties for all Java virtual         
      machines that run on your iSeries 400 system.                        
                                                                           
                                                                           
                                                                           
  o   Or, place a SystemDefault.properties file in your own user.home      
      path.  This file and the properties that it contains override those  
      in /QIBM/UserData/Java400/SystemDefault.properties.  This file sets  
      the default system properties for all Java virtual machines that     
      run for you.                                                         
                                                                           
      Following is an example of a SystemDefault.properties file:          
                                                                           
      java.version=1.2                                                     
                                                                           
                                                                           

Note:   For JDK 1.2+, "java.version" is ignored in
SystemDefault.properties.  This change was made in V4R5 due to a WebSphere
requirement.  To get around this permanent restriction RPG will make a
change to allow the user to specify which version of the JDK to start.
Refer to APAR SE10792


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